AU560425B2 - F.s.k. demodulator logic - Google Patents

F.s.k. demodulator logic

Info

Publication number
AU560425B2
AU560425B2 AU28962/84A AU2896284A AU560425B2 AU 560425 B2 AU560425 B2 AU 560425B2 AU 28962/84 A AU28962/84 A AU 28962/84A AU 2896284 A AU2896284 A AU 2896284A AU 560425 B2 AU560425 B2 AU 560425B2
Authority
AU
Australia
Prior art keywords
flip
flop
demodulator
signals
logic
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Ceased
Application number
AU28962/84A
Other versions
AU2896284A (en
Inventor
Ian Alistair Ward Vance
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
STC PLC
Original Assignee
Standard Telephone and Cables PLC
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Standard Telephone and Cables PLC filed Critical Standard Telephone and Cables PLC
Publication of AU2896284A publication Critical patent/AU2896284A/en
Application granted granted Critical
Publication of AU560425B2 publication Critical patent/AU560425B2/en
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L27/00—Modulated-carrier systems
    • H04L27/10—Frequency-modulated carrier systems, i.e. using frequency-shift keying
    • H04L27/14—Demodulator circuits; Receiver circuits
    • H04L27/144—Demodulator circuits; Receiver circuits with demodulation using spectral properties of the received signal, e.g. by using frequency selective- or frequency sensitive elements
    • H04L27/152—Demodulator circuits; Receiver circuits with demodulation using spectral properties of the received signal, e.g. by using frequency selective- or frequency sensitive elements using controlled oscillators, e.g. PLL arrangements
    • H04L27/1525—Demodulator circuits; Receiver circuits with demodulation using spectral properties of the received signal, e.g. by using frequency selective- or frequency sensitive elements using controlled oscillators, e.g. PLL arrangements using quadrature demodulation

Landscapes

  • Physics & Mathematics (AREA)
  • Spectroscopy & Molecular Physics (AREA)
  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Digital Transmission Methods That Use Modulated Carrier Waves (AREA)
  • Color Television Systems (AREA)
  • Processing Of Color Television Signals (AREA)
  • Burglar Alarm Systems (AREA)
  • Train Traffic Observation, Control, And Security (AREA)
  • Amplifiers (AREA)
  • Signal Processing For Digital Recording And Reproducing (AREA)
  • Compositions Of Macromolecular Compounds (AREA)

Abstract

A demodulator logic for FSK signals on an RF carrier in a direct conversion radio receiver, wherein the received signals are mixed with a local oscillator to provide quadrature baseband signals, characterized in that the demodulator logic comprises two clocked D-type flip-flops, FF1,FF2 one baseband signal being applied direct to the clock input CK of one flip-flop and inverted to the clock input CK of the other flip-flop, the second baseband signal being applied to the D inputs of both flip-flops, one input Q from one flip-flop being algebraically combined with one output &upbar& Q from the other flip-flop to provide a demodulator signal output of the receiver, the two flip-flop outputs being chosen so that for a given FSK value they always have the same logic value.
AU28962/84A 1983-06-02 1984-06-01 F.s.k. demodulator logic Ceased AU560425B2 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GB08315172A GB2141007B (en) 1983-06-02 1983-06-02 Demodulator logic for frequency shift keyed signals
GB8315172 1983-06-02

Publications (2)

Publication Number Publication Date
AU2896284A AU2896284A (en) 1984-12-06
AU560425B2 true AU560425B2 (en) 1987-04-09

Family

ID=10543707

Family Applications (1)

Application Number Title Priority Date Filing Date
AU28962/84A Ceased AU560425B2 (en) 1983-06-02 1984-06-01 F.s.k. demodulator logic

Country Status (11)

Country Link
US (1) US4571738A (en)
EP (1) EP0127941B1 (en)
JP (1) JPS6084052A (en)
AT (1) ATE26197T1 (en)
AU (1) AU560425B2 (en)
DE (1) DE3462844D1 (en)
ES (1) ES8703069A1 (en)
GB (1) GB2141007B (en)
HK (1) HK18488A (en)
NZ (1) NZ208029A (en)
SG (1) SG92887G (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
AU584877B2 (en) * 1984-03-01 1989-06-08 Stc Plc A radio receiver

Families Citing this family (28)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4651107A (en) * 1984-01-11 1987-03-17 Nec Corporation Demodulator for digital FM signals
GB2189114B (en) * 1986-02-12 1990-03-14 Plessey Co Plc Radio receivers
KR920003598B1 (en) * 1988-12-22 1992-05-04 재단법인 한국전자통신 연구소 Frequency and phase detection circuit with the nrz synchronize
CA2014916C (en) * 1989-04-20 1994-11-08 Yoichiro Minami Direct conversion receiver with dithering local carrier frequency for detecting transmitted carrier frequency
GB2233535A (en) * 1989-06-30 1991-01-09 Philips Electronic Associated Radio receiver
US5333151A (en) * 1992-11-23 1994-07-26 Ford Motor Company High speed frequency-shift keying decoder
US7515896B1 (en) 1998-10-21 2009-04-07 Parkervision, Inc. Method and system for down-converting an electromagnetic signal, and transforms for same, and aperture relationships
US6061551A (en) * 1998-10-21 2000-05-09 Parkervision, Inc. Method and system for down-converting electromagnetic signals
US6370371B1 (en) * 1998-10-21 2002-04-09 Parkervision, Inc. Applications of universal frequency translation
US7039372B1 (en) * 1998-10-21 2006-05-02 Parkervision, Inc. Method and system for frequency up-conversion with modulation embodiments
US7236754B2 (en) 1999-08-23 2007-06-26 Parkervision, Inc. Method and system for frequency up-conversion
US6853690B1 (en) * 1999-04-16 2005-02-08 Parkervision, Inc. Method, system and apparatus for balanced frequency up-conversion of a baseband signal and 4-phase receiver and transceiver embodiments
US6879817B1 (en) 1999-04-16 2005-04-12 Parkervision, Inc. DC offset, re-radiation, and I/Q solutions using universal frequency translation technology
US7693230B2 (en) 1999-04-16 2010-04-06 Parkervision, Inc. Apparatus and method of differential IQ frequency up-conversion
US7110444B1 (en) * 1999-08-04 2006-09-19 Parkervision, Inc. Wireless local area network (WLAN) using universal frequency translation technology including multi-phase embodiments and circuit implementations
US7065162B1 (en) 1999-04-16 2006-06-20 Parkervision, Inc. Method and system for down-converting an electromagnetic signal, and transforms for same
US8295406B1 (en) 1999-08-04 2012-10-23 Parkervision, Inc. Universal platform module for a plurality of communication protocols
CA2281236C (en) 1999-09-01 2010-02-09 Tajinder Manku Direct conversion rf schemes using a virtually generated local oscillator
US7010286B2 (en) 2000-04-14 2006-03-07 Parkervision, Inc. Apparatus, system, and method for down-converting and up-converting electromagnetic signals
US7454453B2 (en) * 2000-11-14 2008-11-18 Parkervision, Inc. Methods, systems, and computer program products for parallel correlation and applications thereof
US7072427B2 (en) * 2001-11-09 2006-07-04 Parkervision, Inc. Method and apparatus for reducing DC offsets in a communication system
US7379883B2 (en) * 2002-07-18 2008-05-27 Parkervision, Inc. Networking methods and systems
US7460584B2 (en) * 2002-07-18 2008-12-02 Parkervision, Inc. Networking methods and systems
JP5295137B2 (en) 2007-03-23 2013-09-18 スリーエム イノベイティブ プロパティズ カンパニー Respirator air flow control system
JP5543221B2 (en) 2007-03-23 2014-07-09 スリーエム イノベイティブ プロパティズ カンパニー Air delivery device for respiratory hood
PL2205324T3 (en) 2007-10-05 2018-11-30 3M Innovative Properties Company Respirator flow control apparatus and method
CN101909698B (en) 2007-11-12 2014-03-12 3M创新有限公司 Respirator assembly with air flow direction control
RU2522692C1 (en) * 2012-11-12 2014-07-20 Российская Федерация, от имени которой выступает Государственная корпорация по атомной энергии "Росатом" Radio receiver with autocorrelation separation of frequency-shift keyed continuous-phase signal transmissions

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1517121A (en) * 1977-01-13 1978-07-12 Standard Telephones Cables Ltd Radio receiver for fsk signals
US4193034A (en) * 1978-07-06 1980-03-11 International Standard Electric Corporation Radio receiver for FSK signals
GB2032737A (en) * 1978-10-24 1980-05-08 Standard Telephones Cables Ltd Radio receiver for tone modulated signals
GB2057820B (en) * 1979-09-04 1984-07-04 Standard Telephones Cables Ltd Radio receiver for fsk signals
US4486715A (en) * 1982-08-04 1984-12-04 Honeywell Inc. Frequency shift key demodulator

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
AU584877B2 (en) * 1984-03-01 1989-06-08 Stc Plc A radio receiver

Also Published As

Publication number Publication date
DE3462844D1 (en) 1987-04-30
ATE26197T1 (en) 1987-04-15
HK18488A (en) 1988-03-18
GB2141007B (en) 1986-07-23
US4571738A (en) 1986-02-18
EP0127941B1 (en) 1987-03-25
ES8703069A1 (en) 1986-12-01
GB2141007A (en) 1984-12-05
JPS6084052A (en) 1985-05-13
NZ208029A (en) 1988-02-12
EP0127941A1 (en) 1984-12-12
SG92887G (en) 1989-05-26
ES533041A0 (en) 1986-12-01
AU2896284A (en) 1984-12-06
GB8315172D0 (en) 1983-07-06

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